Hi Dave,
Check out John Deck's blogg.
Google map's projection is Mercator, but uses lat long as
units (rather than metres). I think there's something that Mapserver does
with bounding boxes that other WMS don't do. I haven't successfully got a WMS
overlaid correctly using my mapserver WMSs (3.6.1 and 4.0). I've got close using
John Deck's method, but suffer tile alignment issues that don't affect other WMS
servers.
Might also be worth checking out Mapbuilder. I understand
they have a _javascript_ Mercator/Lat long conversion function. It may be more
accurate than the one John Deck uses.
Steve
From: UMN MapServer Users List [mailto:[EMAIL PROTECTED] On Behalf Of Dave Brown
Sent: November 6, 2005 9:38 AM
To: [email protected]
Subject: [UMN_MAPSERVER-USERS] Google maps projections..
Could any one help
me setting the correct parameters for overlaying my vector maps (latlong wgs84)
over google maps imagery ?
I have the right
bounds etc.. and when I dont specify the projections at all, the correct data is
overlayed but the projection is off..
I am experimenting
with mapserver as I want to move away from mapxtreme, which in
mapxtreme I used to render the map in mercator projection/Nad27 but whatever I
seem to do in mapserver, I get incorrect results..
I using OGRINFO on
one of my MI .TAB files the projection info is...
GEOGCS["unnamed",
DATUM["WGS_1984",
SPHEROID["WGS 84",6378137,298.257223563],
TOWGS84[0,0,0,0,0,0,0]],
PRIMEM["Greenwich",0],
UNIT["degree",0.0174532925199433]]
DATUM["WGS_1984",
SPHEROID["WGS 84",6378137,298.257223563],
TOWGS84[0,0,0,0,0,0,0]],
PRIMEM["Greenwich",0],
UNIT["degree",0.0174532925199433]]
Any help greatly
appreciated.
Thanks,
Dave.
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